1. Council for Agricultural Research and Economics (CREA), Research Centre for Forestry and Wood, Via Valle della Quistione, 27, I-00166, Rome, Italy
2. University of Tuscia, Department for Innovation in Biological, Agro-food and Forest systems (DIBAF), via S. Camillo de??? Lellis, snc, I-01100, Viterbo, Italy
3. Sapienza University of Rome, Department of Methods and Models for Economics, Territory and Finance, Faculty of Economics, Via del Castro Laurenziano, 9, I-00161, Rome, Italy
4. University of Macerata, Department of Economics and Law, Via Armaroli, 43, I-62100, Macerata, Italy